Juniper JUNOSE 11.2.X BGP AND MPLS User Manual

MPLS Terms and Acronyms
Table 50 on page 212 defines terms and acronyms that are used in this discussion of
MPLS.
Table 50: MPLS Terms and Acronyms
DefinitionTerm
Accounting mechanism that tracks resource information. Prevents
requests from being accepted if sufficient resources are not available.
Admission control
Border Gateway Protocol, which provides loop-free interdomain
routing between autonomous systems (ASs) and can act as a label
distribution protocol for MPLS.
BGP
An LSR in a point-to-multipoint LSP that is not an ingress node or
an egress node. A branch node can be connected to other branch
nodes, an ingress node, or an egress node.
Branch node
A mechanism to establish paths based on certain criteria (explicit
route, QoS parameters). The standard routing protocols can be
enhanced to carry additional information to be used when running
the route calculation.
Constraint-based routing
EXP-inferred-PSC LSP. The EXP field of the MPLS Shim Header is
used to determine the per-hop behavior applied to the packet.
E-LSP
A subset of constraint-based routing where the constraint is an
explicit route
Explicit routing
Forwarding equivalence class—Group of IP packets forwarded over
the same path with the same path attributes applied
FEC
•
A particular label distribution protocol used for label distribution
among the routers in an MPLS domain; represented by the
acronym LDP
•
In lowercase—label distribution protocol—a generic term for any
of several protocols that distribute labels among the routers in an
MPLS domain, including BGP, LDP, and RSVP-TE. This usage is
not represented in this text by the acronym, LDP.
Label Distribution
Protocol
Egress LSRs in a point-to-multipoint LSP. It is also referred as a leaf
node.
Leaf
Label Distribution Protocol—A particular protocol used for label
distribution among the routers in an MPLS domain
This text does not use LDP to refer to the generic class of label
distribution protocols.
LDP
Label edge router—A label-switching router serving as an ingress or
egress nodes
LER
Copyright © 2010, Juniper Networks, Inc.212
JunosE 11.2.x BGP and MPLS Configuration Guide

Juniper JUNOSE 11.2.X BGP AND MPLS Specifications

General

Brand	Juniper
Model	JUNOSE 11.2.X BGP AND MPLS
Category	Software
Language	English